SCALES OF SOME AUSTRALIAN FISHES,— COCKERELL. 
37 
Potamalosa novae-hollandise Valenciennes. New South Wales. Scales 
about 8-9 nim. broad and 6|-7 long; basal margin gently convex, not lobed; 
circuli very fine, covering not much more than half of scale, curving upward 
at sides, reaching the margin very obliquely; apical field without distinct 
sculpture, the margin not dentate; a strong entire transverse radius crosses 
near the middle of the scale; basally and sublaterally are many (16 or more) 
more or less incomplete radii, directed toward the nucleus. In young scales 
the circuli appear more transverse. 
Hyperlophus sprattellides Ogilby. Queensland. Scales less tlian 5 mm. 
broad, broader than long or about as broad as long; basal margin usually 
extended in middle ; circuli transverse, covering little more than half of scale ; 
a transverse radius (usually more or less arched upward) crosses the middle 
of the scale; and there are from none to tour incomplete basal radii; apical 
field delicately radiate and conspicuously dentate. 
ENGRAULIDID^. 
Engraulis antipodum Giinther. Queensland. Seales about 3^ mm. 
broad and nearly or quite as long; basal margin more or less convex in middle 
and concave sublaterally; apical field tliin and Avithout circuli, the margin 
not at all dentate; region about and just above middle of scale Avith very fine 
transverse circuli, like those of the clupeids; region below the middle with 
fine but much more widely spaced circuli, which curve upAAmrds at the sides, 
as in non-clupeid fishes, the tAvo systems of circuli meeting at the sides, but 
abruptly discontinuous; radii very irregular, largely bent or zigzag, apical as 
well as lateral and basal, but fcAV, mostly pointing to tbe middle of the scale, 
the apical ones sometimes meeting and forming a broad V. 
CHIROCENTRTD.E. 
Chirocentrus dorab Porskal. Queensland. The scales sent shoAv fine 
transverse circuli, and no radii Avhatever. The apical field is Avithout sculp- 
ture, and its margin entire. The area covered Avith circuli extends in the 
middle as a rounded lobe into the apical field. All this is very different from 
C. dorah from the Philippine Is., which has well-developed radii, as AA^ell as 
different circuli. It AA^ould seem probable that the fishes belong to different 
species. In neither case did I see the fish itself. 
Dr. Max Ellis has in preparation a paper on Clupeoid scales, wdiich wdll 
include a discussion of various Australian species, and will go into a number 
of matters not touched upon here, where I give only what is necessary to 
